-
the FPPU
-
the valve blocks
-
the flap-attachment failure detection sensors.
An APPU is installed at the end of the transmission system in each wing. The APPUs are the same as, and interchangeable with, the FPPU. One synchro transmitter in each APPU sends position data to the SFCC1. The other synchro transmitter in each APPU sends position data to the SFCC2.
The control valve of each valve block has a Linear Variable Differential Transducer (LVDT) (Ref. 27-54-00). The LVDT sends valve position data to its related SFCC. The position of the valve is
1EFF : ALL 1 27-51-00Page 12 1 1 May 01/04R 1 1 1CES 1
directly related to the hydraulic pressure available at the valve block.
An interconnecting strut connects the inboard and the outboard flaps. It has two flap-attachment failure detection sensors. The flap-attachment failure detection sensors monitor the connected flaps for a position difference out of the specified limits.
Each flap-attachment failure detection sensor sends a signal to one of the two Landing Gear Control and Interface Units (LGCIU). Each LGCIU gets a signal from one sensor on each wing and sends the data to its related SFCC. The SFCC monitors the data and sends it to the other SFCC through the cross-computer link. The SFCCs receive data from all four flap-attachment failure detection sensors.
(2) LRU Monitoring
The SFCCs monitor these LRUs for failures:
-SFCC1 and SFCC2
-
the CSU
-
the two WTBs
-
the two APPUs
-
the FPPU
-
the valve blocks of the flap PCU
-
the flap disconnect sensors
-
the hydraulic motors.
The SFCCs keep the data related to the failures in their memories.
(3) Monitoring of Input and Output Signals
The SFCCs monitor these input and output signals:
-
the ARINC 429 inputs from other systems
-
the ARINC 429 inputs from the cross-computer link (other SFCC)
-
the installation coding
-
the operation mode codings
-
the ground inhibit
-
the ARINC 429 outputs (wraparound)
If the obove signals are not in the specified limits, the SFCCs keep the data related to the failure in its memory. The SFCCs transmit the data to the CFDS.
Other discrete inputs are:
-
the Aircraft On Ground (AOG) discrete
-
the WTB-arm input.
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(4) Monitoring of Power Supplies
The SFCCs monitor these power supplies:
-
the SFCC DC Supply
-
the WTB DC Supply
-
the synchro excitation power generated by the SFCCs
-
the LVDT synchro excitation power generated by the SFCCs.
If the voltage is not in the specified limits, the SFCCs keep the data related to the failure in its memory. The SFCCs transmit the data to the CFDS. If the SFCC DC supply or the synchro excitation power is not in the specified limits, the flight crew get a failure indication.
4. Power Supply
____________ (Ref. Fig. 007) The electrical power supplies for the flap control and monitoring system are:
-
the essential bus 401PP
-
the normal bus 204PP
-
the battery buses 701PP and 702PP.
The essential bus 401PP supplies:
-
the SFCC1 flap channel
-
the related PCU solenoids
-
the synchro and LVDT excitation voltages.
The battery bus 701PP supplies the WTB solenoids related to the SFCC1.
The normal bus 204PP supplies:
-
the SFCC2 flap channel
-
the related PCU solenoids
-
the synchro and LVDT excitation voltages.
The battery bus 702PP supplies the WTB solenoids related to the SFCC2.
If the WTBs are operated, the battery buses keep the solenoids energized during a SFCC power failure.
5. Interfaces
__________
(Ref. Fig. 008)
R **ON A/C 001-049, 051-099, 101-149, 201-299,
(Ref. Fig. 009)
Power Supply Distribution - Schematic
Figure 007
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